CPU replacement fan question?

Big Bubba

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Hello to everyone. I have a Emachines model T2792 computer. Last weekend I went to blow the dust out of all the computers in the house and when I went to do my daughters computer one of the fan blades broke off the cpu fan so I went on Ebay and bought another one. Anyway, I installed the new CPU fan and I got a CPU fan failure message on the computer monitor screen saying the computer would shut down in 5 seconds so it did and the fan motor did run. I don't understand why it is not working correctly. Do I need to do anything special after or before I install a CPU fan? Please let me know becuase I am stumped on this one and anyway I am not a computer expert either. Thanks Bob:(
 

Gary H NC

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Re: CPU replacement fan question?

Are you sure its plugged into the same connection as the old fan? It should only plug in one way.Its possible you got a defective fan.:confused:
Plug the old one back in and see if you get the same message...it will be a noisy fan but it should run with a blade missing long enough to test.
 

Big Bubba

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Re: CPU replacement fan question?

HGARY,
Yes, I did. It actually says CPU fan by the 3 pin plug I plugged it into on the mother board. I guess maybe the new fan is defective but it did work at first and then I got a CPU fan failure notice on the computer screen and it shut off on me and I rebooted the computer a few times and did the same thing. I also plugged in the old cpu fan with the broken fan blade and she didn't work either. So I am at a stand still. Let me know Bob:redface:
 

Gary H NC

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Re: CPU replacement fan question?

Thats strange.I guess it no longer recognizes the fan being plugged in.
Ok,we need some computer pro's here...:rolleyes:
 

Big Bubba

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Re: CPU replacement fan question?

Gary H,
I think the fan that I had didn't have the thermo sensing, so now I bought a CPU fan that has the thermo sensing where the fan will speed up or slow down depending on the inside temp of the computer case. I am guessing that that is what it is and I don't know what to do to remedy that problem with the fan not working at all. Yes, I need some serious step by step procedures to get me out of this delima and make my daughter happy with me, LOL. She likes to play here computer games and email her friends. Please let me know, Bob
 

Gary H NC

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Re: CPU replacement fan question?

I had the thermo sensing fan problem on a PC a few years ago,
i think i ended up plugging into another spot on the mother board so it ran constant.
Some fans plug into the power connections coming from the power supply.
A flat style white connector.
I think there are settings in the bios or setup for fans too,for the mother board plug in...
Did you look for another spot for a fan plug in?
Some have more than one.
I have 3 fans in my home PC.
Wish i could be of more help...:(
 

j_martin

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Re: CPU replacement fan question?

The mother board BIOS software senses the fan speed from the tachometer output of the fan. It has a minimum speed setting, which may be settable in the BIOS. What is happening is that whem you turn on your computer, it's cool, so the fan runs slow, and the BIOS deems it inoperable.

The simplest fix would be to get a tach fan that matches the specs of the one you took out. Look up the number on the fan itself and match it.

hope it helps
John
 

NelsonQ

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Re: CPU replacement fan question?

Other option if your BIOS supports it is to disable fan detection. This way the new fan can run, and it shouldn`t complain.

However, note if your fan fails, you won`t know. Just an interim option to get you up and running until you can determine the right solution to fix permanently.
 

redeye1962

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Re: CPU replacement fan question?

Another idea is to look in the bios and see if you can deactivate the cooling system. If you know the fan is working you should be alright.
 

Plainsman

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Re: CPU replacement fan question?

I'd say get the right fan for that motherboard. Disabling settings in the bios is a time bomb waiting to kill the computer.
 

i386

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Aug 24, 2004
Messages
3,548
Re: CPU replacement fan question?

The temperature sensors are generally located inside the CPU socket. Your old fan probably had 3 wires. The 3rd wire is for the "tachometer". If your new fan only has 2 wires, your bios doesn't know the fan is running.
 

dolluper

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Re: CPU replacement fan question?

Termal paste??
CPU Fan Replacement (Revision A.6)
Tools Required: Phillips Screwdriver
HINT: Note the location of all wires, cables, or connectors before disconnecting. These wires, cables, or connectors will need to be
reconnected to either the same or new devices.
Step 1: Turn off your computer and all peripheral devices. Disconnect the power cord from the outlet and then from the back of the
computer. Disconnect all devices connected to the back of the computer (e.g. keyboard, mouse, monitor).
Place the computer on an appropriate work area (a flat-level surface).
WARNING
? The computer must be turned off and disconnected from its power source. Failure to disconnect the power from
the computer may result in personal injury.
? Remove all loose articles and jewelry before touching components inside the computer.
? The case contains sharp edges. Use caution.
? Ground yourself by touching the metal frame every time you remove the cover. If you are not properly
grounded, you could generate static electricity that may cause a component to fail.
? Make sure your hands are dry before performing this task.
www.emachines.com
Figure 1.C
CPU Fan Location
Step 3: Slide the cover toward the rear to free it
from the system and lift it off until it can be removed
completely (Figure 1.B). CAUTION: The case
contains sharp edges.
**Ground yourself by touching the metal frame every
time you remove the cover. If you are not properly
grounded, you could generate static electricity that
may cause a component to fail.
Figure 1.A Figure 1.B
BBBBBB
INTERNAL COMPONENTS
Step 4: Locate the CPU Fan you are replacing
(Figures 1.C).
Step 2: Remove the screws indicated as shown in
Figure 1.A. Do not lose the screws.
If you need assistance with the installation of this part please call our technical support team at 801-401-1419 and follow the menu.
Step 5: Unplug the CPU fan connector. Remove the fan with the heatsink by releasing both tabs on the heatsink that secure the heatsink to
the Socket (Figures 5). Remember the location on the motherboard of the connector.
Hint: For ease, you can lay your computer on its side so that the motherboard is facing upwards.
Step 6: If your replacement CPU fan came with Thermal Compound included in the box, be sure to apply this to ONLY to the raised section
on the bottom of the heat sink. Do not put the thermal compound on the entire bottom section of the heat sink, only the contact
point.
Step 7: Attach the new fan with the heatsink to the socket and secure it with the tabs attached to the socket. Connect the CPU fan connector
to the motherboard (Figure 6).
Step 8: Because the CPU fan is a critical component, it is advised that you power on your system, before putting the left side panel back on,
to verify that the CPU fan is installed correctly and working.
Step 9: Slide the computer cover back into place so that the screw holes are properly aligned. Secure the cover to the case with the screws
previously removed.
Step 10: Reconnect the computer?s devices (e.g. keyboard, mouse, monitor, printer). Reconnect the power cord to the AC power receptacle.
Plug the power cord to the outlet.
Step 11: Turn on the computer and make sure it is functioning properly. If it is not working properly, repeat the steps above and make sure
all the connectors are inserted correctly. If a problem still persists, call our technical support line.
Press Down
To Secure
Lift Levers
To Release
Figures 6
Figures 5
For Celeron or AMD Processors For Pentium 4 Processors
For Celeron or AMD Processors For Pentium 4 Processors
 

orion25

Petty Officer 1st Class
Joined
Aug 7, 2007
Messages
386
Re: CPU replacement fan question?

Just get a compatible CPU fan/heatsink with a molex plug for the fan. Install it with some thermal paste (only a very thin film) and plug it into a spare molex plug. Molex plugs are the white 4 pin plugs that attach to cd/dvd drives and older HDD's. If you cant find a molex based CPU cooler get a molex to 3 pin fan adapter. It will have a molex plug on one end and a 3 pin male plug for the fan on the other. This will bypass the MB fan "features". It will not hurt anything and you cannot overcool a CPU.
 

Big Bubba

Senior Chief Petty Officer
Joined
Apr 11, 2007
Messages
746
Re: UPDATE!!!!CPU replacement fan question?

Re: UPDATE!!!!CPU replacement fan question?

Hello everyone,
My daughters computer is fixed now. It ended up being the CPU header on the motherboard being bad and that is why the fan didn't work but once on initial bootup. I bought the same good used with warranty exact replacement motherboard that was in it and used the new fan that I thought was causing trouble on the old mother board and installed on the new motherboard and she boots up with no problems whatso ever.My daughter is happy with me know and is enjoying her computer again. I guess mysterious things happen that you don't think will happen with electronics. Hopefully no more problems with computers in the house. Thanks again, Bob:)
 
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